Photo-engraving device.



l G. A. LE BEAU & R. R. THRESHBR.

PHOTO ENGRAVING DEVICE.

APPLICATION FILED SEPT. 1, 1910.

Patented July 25, 1911.

WTNESSES.'

, the combinations,

UNITED sTATEs PATENT oEEicE.

QEOEGE AMER-OSE LE BEAU AND EOBEET RAYMOND THEESHEB. 0F. NASHVILLE,-

TENNESSEE, ASSTGNOES OE ONE-THIRD To CHARLES E. NORTON, or NASHVILLE,

TENNESSEE.

PHOTO-LENGRAVING DEVICE.

Specification of Letters Patent.

Patented July 25, 1911.

Application led September 1, 1910. Serial No. 580,137.r

i To all whom it may concern:

ful Improvements in Photo-Engraving Deviees,'of which the following is aspecification.

Our invention relates to improvements in photo-engraving devices, and itconsists in rangements herein described and claimed. An Objectofourinvention is to provide means whereby a ,negative having a betterdetail may be produced.

A further object yof our invention is to provide means for obtaininggood strong sol-id dots in the blacks of the negative in a minimum oftime.

.A further object of our invention is to provide a device foraccomplishing the in front of the cop and to `expose the plate abovementioned objects, which is exceedin ly Simple in its nature andinexpensive.

ther objects and advantages will appear in the following specificationand the novelfeatures of the invention will be particularly pointed -outin the appended claims.

Our invention is illustrated in the accompanying drawings in which-Figure 1 is a side view, showing one embodiment of our invention, Fig. 2is a front view thereof, Fig. 3 is an enlarged section from front torear on the line 3 8 of Fig.

v2, Fig. 4 is an enlarged front view of the slide holder, showing onepassage of the slide, Fig. 5 is a view similar to Fig. 4,-

showing another passage of the Slide, Fig.

f6 is asection on the line 6 6 of Fio. 2,'

and Fig. 7 is a section on the line` 7 5?? of Fig. 4.

In lthe photo-engraving process, it has been customary, before or afterexposing the plate, to place a white card immediately to the lightreflected by the white card,- in

"to this procedure.

order to get a hard small dot in the black of the negative. There arecertain objections In the irst'place, one does not know the axact amountof light that is entering -the lens of the' camera after being reflectedfrom the white sheet, for it isfpbvious that the amount of light dependsupon the distance ofthe white sheet or card constructions and ar-` fromthe lens, the reflecting quality of the paper itself, the angle at whichthe reflection takes place,and other considerations which render thetime of exposure mere -guess work on the part of the operator.

Our apparatus is designed to overcome these lobjections by providing alight of known candle power at a *constant distance from the plate,which can be turned on or otl' instant-ly.

In carrying out our invention, we provide a camera A of the ordinaryform used in photo engraving. This camera is mounted upon va base B, atone end of which is mounted a screen C for holding the copy. To the facea of'the camera which is provided with the opening a', we attach a slideholder such as that shown at D in Figs. 4, 5. This slide holder, as willbe seen from Fig. 6 consists of a back plate d having an opening dadapted to register with the lens opening a in the face of the camera, afront plate cl3 provided with a rectangular opening d* and end and toppieces d5 and d6, respectively, which are placed between the frontandthe rear plates d3 and (l.

Between the -front and rear plates d and d3 is a slide E. This slide,bears the lens F and a cylinder G, in which is mounted a small electriclight H. On one end of the slide D is secured a push button P, which isconnected by means of the spring conductors p to contact strips p. Thelatter are arranged, preferably, flush with the face of the slide andare arranged to be engaged by the'spring conductors p, as clearly shownin Fig. 6. While we have shown this electrical connection in detail, itwill be understood that other means for maintaining the electricalconnection between the push-button and the lamp might be used, withoutdeparting from the spirit of the invention. The lamp Gr is connected tothe conductors p. On top of the camera is a battery X, which isconnected, by means of the wires fr, with the terminals t, 'the latterbeing connected with the push button P, as clearly shown in Fig. 2.

The slide E is so arranged that when it is pushed to one end, the lensopening f will register with that of the back plate d of the slideholder and also with the lens Opening a in the face of the camera. Asmaller opening g is provided, and this opening will be in the center ofthe openings el when the slide is pushed to the opposite end of theslide holder.

, From the foregoing description of the various parts of our device, theoperation thereof may be readily understood.

In making the exposure on the negative, the copy is secured to thescreen C, and the lens F is brought into position for making theexposure. After the exposure is made, the slide E is pushed so as tobring the light G in the position previously occupied by the lens F andthe button P is manipulated so as to cause the light G to glow. Sincethis light is of a given candle power and the distance from the light tothe negative is always the same, one may soon determine the exact timeneeded to give the best detail to the negative.- On relieving thepressure of the push button, the lamp immediately goes out and the platemay then be removed.

In the use of our invention, it will be secn that the lens or the lightmay be brought to the center of the camera by a single movement, therebydoing away with the necessity of placing and replacing the whitereflecting surface in ordinary use. Good results can be obtained infifteen to twenty seconds, while with the old method a longer time isrequired and the results then are not as good as when our device isused.

We claim:

l. In a photo-engraving device, a camera provided with a holder for asensitive plate, a slidable lens holder for .said camera, and a sourceof light carried by said lens holder and adapted to be brought intoposition for exposing said plate.-

2. In a photo-engraving device, a camera provided with a holder for asensitive plate and having a face provided with an opening, a slideholder secured to the face of said camera, a slide carried by said slideholder, and a lens and a source of light mounted on said slide, eachbeing adapted to be brought into registration with the opening in theface of said camera.

3. In a photo-engraving device, a camera provided with a holder for asensitive plate and having a face provided with an opening, a slideholder secured to the face of said camera, a slide carried by said slideholder, a lens and a cylinder mounted on said slide, and an incandescentlamp carried within said cylinder, said lamp and said lens each beingadapted to be brought into registra' tion with the opening in the faceof the camera.

4. In a photo-engraving device, a camera provided with a holder for asensitive plate and having a face provided wit-h an opening, a slideholder secured to the face of said camera, a slide carried by said slideholder, a lens and a cylinder mounted on said slide, an incandescentlamp carried within said cylinder, said lamp and said lens each beingadapted to be brought into registration with the opening in the face ofthe camera, a push button carried by said slide holder, slidingconnections between said push button and said lamp, a source of current,

and connections between said source of current and said push button.-

GEORGE AMBROSE .lill BEAU. ROBERT RAYMOND THRESHER. Witnesses:

MELVIN G. LOWE, ERNEST F. CARROLL.

